我正在使用Django框架构建一个网站,这个网站需要有不同的SQL方案。目前,我已经成功创建了所有方案和相关内容,但我不明白为什么在数据库迁移后每个模式中都会出现django_migrations表。
谢谢。
预期数据库内容:
AppDB表是该应用程序定义的所有模型
默认DB表是所有Django表(admin、contenttypes、auth、sessions)
数据库内容:
AppDB表是该应用程序定义的所有模型+django_migrations
DEFAULT表是所有Django表(admin、contenttypes、auth、sessions)+django_migrations
这些是两个数据库的路由器:
class DefaultRouter(object):
APPS = ['auth', 'sessions', 'admin', 'contenttypes']
DB = 'default'
def db_for_read(self, model, **hints):
if model._meta.app_label in self.APPS:
return self.DB
return None
def db_for_write(self, model, **hints):
if model._meta.app_label in self.APPS:
return self.DB
return None
def allow_relation(self, obj1, obj2, **hints):
if obj1._meta.app_label in self.APPS or obj2._meta.app_label in self.APPS:
return True
return None
def allow_migrate(self, db, app_label, model_name=None, **hints):
if app_label in self.APPS:
return db == self.DB
return None
class MyAppDBRouter(object):
def db_for_read(self, model, **hints):
return self.check_app_label(model)
def db_for_write(self, model, **hints):
return self.check_app_label(model)
def allow_relation(self, obj1, obj2, **hints):
if obj1._meta.app_label == 'myapp' or obj2._meta.app_label == 'myapp':
return True
return None
def allow_migrate(self, db, app_label, model_name=None, **hints):
if app_label == 'myapp':
return db == 'appdb'
return None
@staticmethod
def check_app_label(model):
if model._meta.app_label == 'myapp':
return 'appdb'
return None
谢谢。